CN1164887C - Pressure vessel consisting of a plastic core vessel for storing a pressurized liquid and/or gas, reinforced with a fiber-reinforced plastic, and method for the production thereof - Google Patents

Abstract

A plastic core container reinforced with a fiber plastic composite, comprising a core container, one or more joint parts being provided in the neck and/or base and/or cylindrical part of the container, at least one joint part accommodating a feed member having a cylindrical or conical screw thread screwed in, a cylindrical insert being mounted in the connecting stem part of the container, the insert having a covered shaft-ring-shaped end at the end of the connecting stem part, at least two sealing elements being provided, one between the insert and the inner surface of the connecting stem part and two between the insert and the feed member, the joint parts being in the shape of a collar relative to the connecting stem part. The manufacturing method comprises the steps of fitting the insert into the connecting rod portion after the inner surface of the connecting rod portion has been shaped, providing a high dimensional accuracy of the outer shape of the connecting rod portion by means of the outer shape of the insert, fitting the insert into the connecting rod portion by shrinking the preheated connecting rod portion of the plastic core container, and/or pressing and/or shrinking the insert after the insert has been cooled beforehand.

Description

Pressure vessel consisting of a plastic core vessel reinforced with fiber-reinforced plastics for storing pressurized liquids and/or gases and method for its manufacture

technical field

The invention relates to a pressure vessel for storing liquids and/or gases under pressure, the pressure vessel having a space for storing the medium and at least one connection for filling and/or emptying. The invention also relates to a method of manufacturing such a container.

Background technique

Liquids and/or gases are generally transported in pressure vessels, and these containers must have such a structure that they can prevent the leakage, diffusion or penetration of the medium stored therein, can resist the mechanical stress of internal and external pressure, and can withstand the pressure during use. Further stresses from mechanical, physical and chemical properties in the process.

By properly combining the polymer as the matrix with the high-strength fiber as the reinforcement, and by selecting a suitable reinforcement structure, the properties of the material can be adapted to the requirements for storing media and making components. Pressure vessels made of fiber-plastic composites are equivalent to conventional steel or aluminum vessels in terms of applicability to pressure technology, but at a different price and, in addition, have crucial advantages such as light weight and corrosion resistance Increased capacity and strong fatigue resistance.

Pressure vessels made of fiber-plastic composites and polymer matrix systems are well known and there are currently a large number of patents in this regard.

As an example, see European patent EP-0 810 081A1 entitled "Pressure vessel and method of manufacture thereof". It describes how to cover a fiber-plastic composite on a closed sheath made of plastic during the fiber winding process. A similar principle for containers is described in European Patent EP-0 333 013 A1 entitled "Pressure Vessel". The cladding, also surrounded by fibers, enables the reinforced shell to withstand mechanical stress.

In DE197 51 411 C1, DE195 261 54 C2, EP0.821.194.A2 (Mannesmann), EP0.300.931 (Ullit), EP0.333.013 A1 (ABB Plast), EP0.550.951 A1 (Brunswick), EP0.553.728 A1 (EDO ) and other known types of structures are described in the patent text of WO94/12396 (NGV Systems). These patent texts describe pressure vessels for gases and/or liquids, consisting of a plastic matrix, with metal joint parts of different constructions, except for EP0.333.013 A1, the other patent texts basically describe the same patent content, while EP0.333.013A1 describes the process technology of the winding method and the laminated structure, especially the ratio of optimal core geometry to optimal stress in fiber composite materials.

The techniques described in the aforementioned patents all have some disadvantages, especially in terms of leakage in the area of the connectors and costly manufacturing techniques.

The connector technology described in the EDO patent leads, for example, to leaks in the region of the connector between the metal fitting part and the plastic base body after a relatively short period of operation, with the result that the container has to be taken out of service. There are still patents such as NVG Systems that have not been used so far, probably because the cost of the manufacturing process is too high. Among the containers designed with the Brunswick patent, some containers failed in use due to leakage (source: Powertech Labs/Vancouver).

French patent application FR2301746 discloses a container for storing fluids under pressure, the container is composed of two concentric bushings and a joint part, the inner liner seals the container, the outer liner provides mechanical stability for the container, and the joint part is inserted into the Between the covers of the container. The inner liner has a neck extending outwardly from the opening of the container and surrounded by the connector, while the extension of the neck forms an angle between 15 and 60 degrees relative to the axis of the container. In the assembly disclosed in this application, the shape of the inner bushing has disadvantages, for example, its neck can only be formed after insertion of the fitting parts.

Contents of the invention

The present invention relates to pressure vessels of fibrous plastic composites for storing liquid and/or gaseous media under pressure with plastic core containers, wherein the purpose of the present invention is to further develop pressure vessels so as to avoid the above-mentioned disadvantages of the prior art and their failure in use Shortcomings. The fiber-plastic composite container is light in weight, corrosion-resistant and fatigue-resistant, and at the same time can be sealed for a long time, can withstand mechanical stress, and is cheap to manufacture.

The pressure vessel of the present invention has been further developed relative to the pressure vessel of the fiber-plastic composite in the prior art, especially the joint parts, which can be sealed with high quality for a long time, even when the thermal and mechanical working stress changes greatly. The same is true for large cases.

According to one aspect of the present invention, the object of the present invention is to solve the leakage problem of a previously described container, thereby providing a plastic core container reinforced with a fiber-plastic composite for storing liquid and/or gaseous media under pressure, It consists of a plastic core container on the neck and/or base and/or barrel of the container is provided with one or more fitting parts, at least one of which is configured to accommodate a pressure hose feed, which The piece has a cylindrical or conical thread that can be screwed in. A cylindrical insert is installed on the connecting rod of the plastic core container. At least two seals are provided, at least one between the insert and the inner surface of the plastic connecting rod of the plastic core container, at least one other seal is provided between the insert and the pressure hose feed, the joint part relative to The surface of the connecting rod portion of the plastic core container is in the shape of a collar.

In one construction, the insert has an annular groove to accommodate a sealing ring beneath the protruding collar of the insert between the insert and the inner surface of the connector stem of the plastic ring core container. Furthermore, in a further embodiment, there is a further annular groove in the surface of the projection ring of the insert part, in which there is a sealing ring which is pressed by a pressure hose feed, for example a pipe connection and/or a valve. In yet another configuration, the cylindrical portion of the core container is provided with an aperture for filling and emptying the container.

The joint part is made in the form of a collar with respect to the surface of the plastic core container in order to ensure an efficient transmission of forces between the fiber plastic compound and the joint part which has, for example, notches in the area where it bonds with the fiber plastic compound , raised areas and/or keyed surfaces.

For example, plastic fibers, aramid fibers, carbon fibers, polymer fibers, organic fibers, metal fibers and/or other types of fibers, without excluding other materials, can be used as reinforcing fibers in fiber-plastic composites.

With regard to the method of manufacturing a pressure vessel of fibrous plastic composite for storage of a liquid and/or gaseous medium above atmospheric pressure, the present invention is solved by the following steps: After forming the inner surface of the connecting rod part of the plastic core vessel , inserting an insert into the connecting rod of the plastic core container, the outer geometry of the connecting rod has a high dimensional accuracy by means of the defined cylindrical outer geometry of the insert, wherein the preheating of the shrinking plastic core container Fitting the insert into the connecting rod, and/or pressing and/or shrinking the insert after the insert has precooled.

Additionally, the insert is installed prior to the fitting of the joint parts to the connecting rod portion of the plastic core container.

The method according to the invention can provide a container which has the advantages described herein and fully considered above in terms of action, function and effect.

The storage medium can be air, oxygen, nitrogen, carbon dioxide, propane, natural gas, hydrogen or any other technical gas or liquid or similar substances. The present invention is not limited to storing specific gases and/or liquids.

According to yet another aspect of the present invention, the above-mentioned container, especially the container made by the method of the present invention, can be used for various purposes.

Examples of possible applications, such as, but not limited to, use as storage for combustible gases such as natural gas or hydrogen, pressure vessels for gas-fired vehicles, pressure vessels for pneumatic and hydraulic applications, compressed air for heavy-duty trucks, buses and railways storage, pressure vessels for fire extinguishers, pressure vessels for safety systems such as air bags, and pressure vessels for propane gas.

Description of drawings

The present invention will be described in detail below in conjunction with embodiment and accompanying drawing, in the accompanying drawing:

Fig. 1 is a sectional view of the connector region of the present invention,

Figure 2 is a schematic plan view of a container according to a second embodiment of the invention, wherein a filling and emptying hole is provided in the center of the lid,

3 is a schematic plan view of a container according to a third embodiment of the present invention, in which there are two staggered filling holes and emptying holes arranged on the lid,

Figure 4 is a side view of the container of Figures 1-3 of the present invention, wherein a filling and emptying hole may optionally be added to the cylindrical portion of the container.

Detailed ways

In Fig. 1, the connector area of an embodiment is schematically shown in section. In a plastic core container 2 reinforced with a fiber-plastic compound 1 for liquid and/or gaseous media under pressure, a fitting part 3 is fitted in the container neck and/or base and/or cylindrical part .

In the joint part 3 of the plastic core container 2 is arranged an insert 4 which covers the outlet of the connector stem of the plastic core container 2 in the manner of a collar.

The insert 4 has an annular groove so that the sealing ring under the protruding ring of the insert 4 is placed between the insert and the inner surface of the connector stem of the plastic ring core container 2, on the surface of the protruding ring of the insert There is also an annular groove on the top, in which there is a sealing ring, which is pressed by the pressure hose feeding part 5 (pipe connection and/or valve). Furthermore, by means of prior machining of the connecting rods or other suitable manufacturing methods, the inner surface of the connecting rods of the plastic core container can be bonded to the insert, for example by shrinkage, and the outer geometry of the connecting rods of the final plastic core container can have more precise dimensions.

The joint part 3 is in the shape of a collar with respect to the plastic core container 2, on the surface of the collar there may or may not be a raised area and/or on the outer surface of the joint part in the area of the fiber plastic compound 1 there are Several keyed surfaces offset by 90°. This arrangement of the joint parts enables efficient transmission of the force of the fiber plastic compound 1 to the joint part 3, thereby preventing twisting during assembly and disassembly of pipe connections or valves.

The process of manufacturing method is:

a) During the manufacturing process of the plastic core container, the inner surface structure of the connecting rod part of the plastic core container is made into a suitable shape and/or the inner surface of the connecting rod part of the plastic core container is processed in subsequent machining to accommodate insert.

b) Fitting the insert into the connecting rod by shrinking the preheated connecting rod and/or pressing and/or shrinking the insert into the plastic core after precooling the insert Inside the outlet of the connecting rod of the container.

c) Assembling the joint part on the outer surface of the connecting rod part of the plastic core container, wherein the underside of the collar of the joint part is firmly fitted to the outer surface of the plastic core container with a suitable fastening process.

d) Reinforce the pre-assembled plastic core container with fiber plastic compound and start the installation of the pressure hose feed.

In FIG. 2 , a schematic plan view of a core container according to an embodiment of the invention is shown, wherein the core container can be filled and/or emptied via a centrally mounted joint part 3 .

In FIG. 3 , a schematic plan view of a core container according to another embodiment of the invention is shown, wherein the core container can be filled and/or emptied via two offset joint parts 3 .

FIG. 4 shows by way of example an alternative structure to that of FIGS. 2 and 3 , in which, for technical reasons, it is necessary to provide a further connecting piece 3 in the cylindrical part of the core container.

Claims (8)

1. A plastic core container for storing liquid and/or gaseous media under pressure, reinforced with fiber-plastic composites, comprising a plastic core container provided with one or one The above joint parts, wherein at least one of the joint parts is made to accommodate a pressure hose feed-in with a cylindrical or conical thread that can be screwed in, characterized in that at the connecting rod part of the plastic core container Mounting a cylindrical insert, at the end of the connecting stem the insert has a covered or surrounding collar-shaped end, wherein at least two seals are provided, at least one between the insert and the plastic connecting stem of the plastic core container Between the inner surfaces, at least one further seal is provided between the insert and the pressure hose feed, and the joint part is in the shape of a collar relative to the surface of the connecting rod of the plastic core container. 2. The plastic core container reinforced with fiber plastic composites according to claim 1, characterized in that the seal between the insert and the inner surface of the connecting rod of the plastic core container and/or in the shaft of the insert The seal between the ring surface and the pressure hose feed is formed by an annular groove and a seal and/or another suitable seal or gasket. 3. The plastic core container reinforced with fiber-plastic composites as claimed in claim 1, wherein the collar surface of the joint part matches the contour of the surface of the plastic core container, and the collar can be fastened with a suitable fastening process. The underside is firmly secured to the outer surface of the plastic core container. 4. The plastic core container reinforced with fiber-plastic composites as claimed in claim 1, wherein the joint parts are connected to the connecting rods of the plastic core container by threaded parts and/or adhesives and/or other fastening processes The outer surface of the portion and/or the outer surface of the surrounding collar of the insert. 5. Plastic core container reinforced with fiber-plastic composites according to claim 1, characterized in that the joint part is provided with a conical or cylindrical internal thread for receiving a pressure hose feed. 6. Plastic core container reinforced with fiber-plastic composites according to claims 1 to 5, characterized in that fiber plastic is used in the cylindrical recesses of the joint parts according to the most favorable mechanical stress on the collar surface Composite in which a raised portion or recessed portion on the collar surface and/or keyed surface of a joint part in the region of the fiber-plastic composite is on the fiber-plastic composite relative to the valve or pipe sealed inside The joint parts create greater resistance to torsional resistance. 7. Method for manufacturing a plastic core container for storing a liquid and/or gaseous medium under pressure, reinforced with a fiber-plastic composite, characterized in that, After the inner surface of the connecting rod of the plastic core container has been shaped, an insert is inserted into the connecting rod of the plastic core container, the outer geometry of the connecting rod having a higher height by means of the defined cylindrical outer geometry of the insert Dimensional accuracy in which the insert is fitted into the connecting rod by shrinking the pre-heated connecting rod of the plastic core container and/or pressing and/or shrinking the insert after the insert has pre-cooled. 8. A method of manufacturing a plastic core container reinforced with a fiber plastic composite as claimed in claim 7, wherein the insert is fitted prior to fitting the joint part to the connecting rod portion of the plastic core container.

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